Method of making rotary cutters



(No Model.)

D. H. CHURCH.

METHOD 01-" MAKING ROTARY GUTTERS.

No. 299,348. Patented May 27, 1884.

N. FUERS. PholeUihugmpMr. Walhington. DJ;

DUANE H. CHURCH, OF WVALTHAM, MASSACHUSETTS.

METHOD OF MAKING ROTARY CUTTERS.

SPECIFICATION forming part of Letters Patent No. 299,348, dated May 27, 18184.

Application filed December 29, 1883.

(No model.)

T0 at whom it may concern:

Be it known that I, DUANE H. CHURCH, of Waltham, in the county of Middlesex and State of Massachusetts, have invented certain Improvements in Methods of Making Rotary Cutters, of which the following is a specification.

This invention has for its object to provide an improved method of making rotary cutters for milling and other purposes; and'it consists in providing a metal disk with cutting-teeth having all the qualities required to adapt them for cutting, except the necessary clearance or inclination of the backs of the teeth, and then producing such clearance by bending the bases or rear portions of the teeth inwardly, the disk being slotted at the bases of the teeth to permit such inward bending, as I will now proceed to describe.

Of the accompanying drawings, forming a part of this specification, Figure 1 represents a side elevation of the cutter as formed be fore the bending operation. Fig. 2 represents a side elevation of the completed cutter.

The same letters of reference indicate the same parts in all the figures.

In carrying out my invention,I take a metal disk and mold its periphery to the desired form in transverse section, so that the completed cutter will impart the desired shape to the surface on which it acts. The periphery of the disk is slotted at b b to form the front surfaces, 2, of the cutting-teeth, the cuttingedges of said teeth being formed by the intersection of said surfaces 2 with the periphery of the disk. The backs of the teeth are now simply segments of the circular periphery of the disk, and therefore have no inclination or clearance. This latter is produced by slotting the disk at the bases or heel portions of the teeth, as shown at c c, and then bending said heel portions inwardly until the mouths of the slots 0 are Wholly or partially closed. The backs of the teeth are thus inclined so that I the cutting-edges are higher than the heels of the teeth, and therefore have the requisite clearance.

It Will be seen that the described method enables a cutter to be easily made.

Heretofore rotary cutters for molding boot or shoe heels have been made by slotting a disk or body to form teeth and bending the teeth backwardly or outwardly from the center of the disk. Said method is not practicable for small milling or metal-working cutters, because it is not easy to introduce a tool into said slots for the purpose of bending back the cutters. My improved method only requires inward pressure against the backs of the teeth to effect the desired result. The cutter formed by my improved method is better than that formed by that previously practiced, the slots forming the front surfaces of the teeth being of less depth, so that the teeth are stronger and stiffer, and their front surfaces are not marred by the bending operation.

I claim 1. The improved method of making rotary cutters herein described, the same consisting in slotting a disk to form the front edges of the cutting teeth, then slotting the disk at the rear portions of the teeth, and then bending the rear portions of the teeth inwardly, as set forth.

2. The improved rotary cutter, having the transverse slots at b b, forming the front surfaces of the teeth, and the slots 0 c at the rear portions of said teeth, whereby the backs of the teeth are enabled to be bent, and thus given the requisite clearance, as set forth.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, this 24th day of December, 1883.

DUANE H. CHURCH.

\Vitnesses:

G. F. BRowN, A. L. WHITE. 

